Seems like a pretty good idea if you already use Google Calendar and you have any inclination to keep a journal of some sort (ie. training log or work journal).
Using it as a journal
I’ve already begun using it as a personal journal – recording anything from how often I use the health club, to personal feelings or ideas that I wish to jot down somewhere.
It works by simply creating a new “event” as an individual journal entry. The events are automatically date and time stamped, so you always know when you wrote something. And, obviously, since it’s a calendar – the events are organized by “day,” keeping a chronological archive of all entries ever written.
The event name is the journal entry headline, and you can use the description part of the event as the body of the journal entry.